1 // SPDX-License-Identifier: GPL-2.0 <<
2 /* 1 /*
3 * Functions related to generic helpers functi 2 * Functions related to generic helpers functions
4 */ 3 */
5 #include <linux/kernel.h> 4 #include <linux/kernel.h>
6 #include <linux/module.h> 5 #include <linux/module.h>
7 #include <linux/bio.h> 6 #include <linux/bio.h>
8 #include <linux/blkdev.h> 7 #include <linux/blkdev.h>
9 #include <linux/scatterlist.h> 8 #include <linux/scatterlist.h>
10 9
11 #include "blk.h" 10 #include "blk.h"
12 11
13 static sector_t bio_discard_limit(struct block !! 12 static struct bio *next_bio(struct bio *bio, unsigned int nr_pages,
>> 13 gfp_t gfp)
14 { 14 {
15 unsigned int discard_granularity = bde !! 15 struct bio *new = bio_alloc(gfp, nr_pages);
16 sector_t granularity_aligned_sector; <<
17 16
18 if (bdev_is_partition(bdev)) !! 17 if (bio) {
19 sector += bdev->bd_start_sect; !! 18 bio_chain(bio, new);
20 !! 19 submit_bio(bio);
21 granularity_aligned_sector = !! 20 }
22 round_up(sector, discard_granu <<
23 21
24 /* !! 22 return new;
25 * Make sure subsequent bios start ali <<
26 * it needs to be split. <<
27 */ <<
28 if (granularity_aligned_sector != sect <<
29 return granularity_aligned_sec <<
30 <<
31 /* <<
32 * Align the bio size to the discard g <<
33 * at discard granularity boundaries e <<
34 */ <<
35 return round_down(UINT_MAX, discard_gr <<
36 } 23 }
37 24
38 struct bio *blk_alloc_discard_bio(struct block !! 25 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
39 sector_t *sector, sector_t *nr !! 26 sector_t nr_sects, gfp_t gfp_mask, int flags,
>> 27 struct bio **biop)
40 { 28 {
41 sector_t bio_sects = min(*nr_sects, bi !! 29 struct request_queue *q = bdev_get_queue(bdev);
42 struct bio *bio; !! 30 struct bio *bio = *biop;
>> 31 unsigned int granularity;
>> 32 unsigned int op;
>> 33 int alignment;
>> 34 sector_t bs_mask;
43 35
44 if (!bio_sects) !! 36 if (!q)
45 return NULL; !! 37 return -ENXIO;
46 38
47 bio = bio_alloc(bdev, 0, REQ_OP_DISCAR !! 39 if (flags & BLKDEV_DISCARD_SECURE) {
48 if (!bio) !! 40 if (flags & BLKDEV_DISCARD_ZERO)
49 return NULL; !! 41 return -EOPNOTSUPP;
50 bio->bi_iter.bi_sector = *sector; !! 42 if (!blk_queue_secure_erase(q))
51 bio->bi_iter.bi_size = bio_sects << SE !! 43 return -EOPNOTSUPP;
52 *sector += bio_sects; !! 44 op = REQ_OP_SECURE_ERASE;
53 *nr_sects -= bio_sects; !! 45 } else {
54 /* !! 46 if (!blk_queue_discard(q))
55 * We can loop for a long time in here !! 47 return -EOPNOTSUPP;
56 * discards (like mkfs). Be nice and !! 48 if ((flags & BLKDEV_DISCARD_ZERO) &&
57 * softlocking if preempt is disabled. !! 49 !q->limits.discard_zeroes_data)
58 */ !! 50 return -EOPNOTSUPP;
59 cond_resched(); !! 51 op = REQ_OP_DISCARD;
60 return bio; !! 52 }
61 } <<
62 53
63 int __blkdev_issue_discard(struct block_device !! 54 bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
64 sector_t nr_sects, gfp_t gfp_m !! 55 if ((sector | nr_sects) & bs_mask)
65 { !! 56 return -EINVAL;
66 struct bio *bio; !! 57
>> 58 /* Zero-sector (unknown) and one-sector granularities are the same. */
>> 59 granularity = max(q->limits.discard_granularity >> 9, 1U);
>> 60 alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
>> 61
>> 62 while (nr_sects) {
>> 63 unsigned int req_sects;
>> 64 sector_t end_sect, tmp;
>> 65
>> 66 /* Make sure bi_size doesn't overflow */
>> 67 req_sects = min_t(sector_t, nr_sects, UINT_MAX >> 9);
>> 68
>> 69 /**
>> 70 * If splitting a request, and the next starting sector would be
>> 71 * misaligned, stop the discard at the previous aligned sector.
>> 72 */
>> 73 end_sect = sector + req_sects;
>> 74 tmp = end_sect;
>> 75 if (req_sects < nr_sects &&
>> 76 sector_div(tmp, granularity) != alignment) {
>> 77 end_sect = end_sect - alignment;
>> 78 sector_div(end_sect, granularity);
>> 79 end_sect = end_sect * granularity + alignment;
>> 80 req_sects = end_sect - sector;
>> 81 }
>> 82
>> 83 bio = next_bio(bio, 0, gfp_mask);
>> 84 bio->bi_iter.bi_sector = sector;
>> 85 bio->bi_bdev = bdev;
>> 86 bio_set_op_attrs(bio, op, 0);
>> 87
>> 88 bio->bi_iter.bi_size = req_sects << 9;
>> 89 nr_sects -= req_sects;
>> 90 sector = end_sect;
>> 91
>> 92 /*
>> 93 * We can loop for a long time in here, if someone does
>> 94 * full device discards (like mkfs). Be nice and allow
>> 95 * us to schedule out to avoid softlocking if preempt
>> 96 * is disabled.
>> 97 */
>> 98 cond_resched();
>> 99 }
67 100
68 while ((bio = blk_alloc_discard_bio(bd !! 101 *biop = bio;
69 gfp_mask))) <<
70 *biop = bio_chain_and_submit(* <<
71 return 0; 102 return 0;
72 } 103 }
73 EXPORT_SYMBOL(__blkdev_issue_discard); 104 EXPORT_SYMBOL(__blkdev_issue_discard);
74 105
75 /** 106 /**
76 * blkdev_issue_discard - queue a discard 107 * blkdev_issue_discard - queue a discard
77 * @bdev: blockdev to issue discard for 108 * @bdev: blockdev to issue discard for
78 * @sector: start sector 109 * @sector: start sector
79 * @nr_sects: number of sectors to discard 110 * @nr_sects: number of sectors to discard
80 * @gfp_mask: memory allocation flags (for b 111 * @gfp_mask: memory allocation flags (for bio_alloc)
>> 112 * @flags: BLKDEV_IFL_* flags to control behaviour
81 * 113 *
82 * Description: 114 * Description:
83 * Issue a discard request for the sectors 115 * Issue a discard request for the sectors in question.
84 */ 116 */
85 int blkdev_issue_discard(struct block_device * 117 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
86 sector_t nr_sects, gfp_t gfp_m !! 118 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
87 { 119 {
88 struct bio *bio = NULL; 120 struct bio *bio = NULL;
89 struct blk_plug plug; 121 struct blk_plug plug;
90 int ret; 122 int ret;
91 123
92 blk_start_plug(&plug); 124 blk_start_plug(&plug);
93 ret = __blkdev_issue_discard(bdev, sec !! 125 ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, flags,
>> 126 &bio);
94 if (!ret && bio) { 127 if (!ret && bio) {
95 ret = submit_bio_wait(bio); 128 ret = submit_bio_wait(bio);
96 if (ret == -EOPNOTSUPP) !! 129 if (ret == -EOPNOTSUPP && !(flags & BLKDEV_DISCARD_ZERO))
97 ret = 0; 130 ret = 0;
98 bio_put(bio); 131 bio_put(bio);
99 } 132 }
100 blk_finish_plug(&plug); 133 blk_finish_plug(&plug);
101 134
102 return ret; 135 return ret;
103 } 136 }
104 EXPORT_SYMBOL(blkdev_issue_discard); 137 EXPORT_SYMBOL(blkdev_issue_discard);
105 138
106 static sector_t bio_write_zeroes_limit(struct !! 139 /**
107 { !! 140 * __blkdev_issue_write_same - generate number of bios with same page
108 sector_t bs_mask = (bdev_logical_block !! 141 * @bdev: target blockdev
109 !! 142 * @sector: start sector
110 return min(bdev_write_zeroes_sectors(b !! 143 * @nr_sects: number of sectors to write
111 (UINT_MAX >> SECTOR_SHIFT) & ~ !! 144 * @gfp_mask: memory allocation flags (for bio_alloc)
112 } !! 145 * @page: page containing data to write
113 !! 146 * @biop: pointer to anchor bio
114 /* !! 147 *
115 * There is no reliable way for the SCSI subsy !! 148 * Description:
116 * device supports a WRITE SAME operation with !! 149 * Generate and issue number of bios(REQ_OP_WRITE_SAME) with same page.
117 * to media. As a result, write_zeroes is enab <<
118 * disabled if a zeroing operation subsequentl <<
119 * queue limit is likely to change at runtime. <<
120 */ 150 */
121 static void __blkdev_issue_write_zeroes(struct !! 151 static int __blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
122 sector_t sector, sector_t nr_s !! 152 sector_t nr_sects, gfp_t gfp_mask, struct page *page,
123 struct bio **biop, unsigned fl !! 153 struct bio **biop)
124 { !! 154 {
>> 155 struct request_queue *q = bdev_get_queue(bdev);
>> 156 unsigned int max_write_same_sectors;
>> 157 struct bio *bio = *biop;
>> 158 sector_t bs_mask;
125 159
126 while (nr_sects) { !! 160 if (!q)
127 unsigned int len = min(nr_sect !! 161 return -ENXIO;
128 struct bio *bio; <<
129 162
130 if ((flags & BLKDEV_ZERO_KILLA !! 163 bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
131 fatal_signal_pending(curre !! 164 if ((sector | nr_sects) & bs_mask)
132 break; !! 165 return -EINVAL;
133 166
134 bio = bio_alloc(bdev, 0, REQ_O !! 167 if (!bdev_write_same(bdev))
135 bio->bi_iter.bi_sector = secto !! 168 return -EOPNOTSUPP;
136 if (flags & BLKDEV_ZERO_NOUNMA <<
137 bio->bi_opf |= REQ_NOU <<
138 169
139 bio->bi_iter.bi_size = len << !! 170 /* Ensure that max_write_same_sectors doesn't overflow bi_size */
140 *biop = bio_chain_and_submit(* !! 171 max_write_same_sectors = UINT_MAX >> 9;
141 172
142 nr_sects -= len; !! 173 while (nr_sects) {
143 sector += len; !! 174 bio = next_bio(bio, 1, gfp_mask);
>> 175 bio->bi_iter.bi_sector = sector;
>> 176 bio->bi_bdev = bdev;
>> 177 bio->bi_vcnt = 1;
>> 178 bio->bi_io_vec->bv_page = page;
>> 179 bio->bi_io_vec->bv_offset = 0;
>> 180 bio->bi_io_vec->bv_len = bdev_logical_block_size(bdev);
>> 181 bio_set_op_attrs(bio, REQ_OP_WRITE_SAME, 0);
>> 182
>> 183 if (nr_sects > max_write_same_sectors) {
>> 184 bio->bi_iter.bi_size = max_write_same_sectors << 9;
>> 185 nr_sects -= max_write_same_sectors;
>> 186 sector += max_write_same_sectors;
>> 187 } else {
>> 188 bio->bi_iter.bi_size = nr_sects << 9;
>> 189 nr_sects = 0;
>> 190 }
144 cond_resched(); 191 cond_resched();
145 } 192 }
>> 193
>> 194 *biop = bio;
>> 195 return 0;
146 } 196 }
147 197
148 static int blkdev_issue_write_zeroes(struct bl !! 198 /**
149 sector_t nr_sects, gfp_t gfp, !! 199 * blkdev_issue_write_same - queue a write same operation
>> 200 * @bdev: target blockdev
>> 201 * @sector: start sector
>> 202 * @nr_sects: number of sectors to write
>> 203 * @gfp_mask: memory allocation flags (for bio_alloc)
>> 204 * @page: page containing data
>> 205 *
>> 206 * Description:
>> 207 * Issue a write same request for the sectors in question.
>> 208 */
>> 209 int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
>> 210 sector_t nr_sects, gfp_t gfp_mask,
>> 211 struct page *page)
150 { 212 {
151 sector_t limit = bio_write_zeroes_limi <<
152 struct bio *bio = NULL; 213 struct bio *bio = NULL;
153 struct blk_plug plug; 214 struct blk_plug plug;
154 int ret = 0; !! 215 int ret;
155 216
156 blk_start_plug(&plug); 217 blk_start_plug(&plug);
157 __blkdev_issue_write_zeroes(bdev, sect !! 218 ret = __blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask, page,
158 flags, limit); !! 219 &bio);
159 if (bio) { !! 220 if (ret == 0 && bio) {
160 if ((flags & BLKDEV_ZERO_KILLA <<
161 fatal_signal_pending(curre <<
162 bio_await_chain(bio); <<
163 blk_finish_plug(&plug) <<
164 return -EINTR; <<
165 } <<
166 ret = submit_bio_wait(bio); 221 ret = submit_bio_wait(bio);
167 bio_put(bio); 222 bio_put(bio);
168 } 223 }
169 blk_finish_plug(&plug); 224 blk_finish_plug(&plug);
170 <<
171 /* <<
172 * For some devices there is no non-de <<
173 * WRITE ZEROES is actually supported. <<
174 * on an I/O error, in which case we'l <<
175 * "not supported" here. <<
176 */ <<
177 if (ret && !bdev_write_zeroes_sectors( <<
178 return -EOPNOTSUPP; <<
179 return ret; 225 return ret;
180 } 226 }
>> 227 EXPORT_SYMBOL(blkdev_issue_write_same);
181 228
182 /* !! 229 /**
183 * Convert a number of 512B sectors to a numbe !! 230 * __blkdev_issue_write_zeroes - generate number of bios with WRITE ZEROES
184 * The result is limited to a number of pages !! 231 * @bdev: blockdev to issue
185 * Also make sure that the result is always at !! 232 * @sector: start sector
186 * where nr_sects is lower than the number of !! 233 * @nr_sects: number of sectors to write
>> 234 * @gfp_mask: memory allocation flags (for bio_alloc)
>> 235 * @biop: pointer to anchor bio
>> 236 *
>> 237 * Description:
>> 238 * Generate and issue number of bios(REQ_OP_WRITE_ZEROES) with zerofiled pages.
187 */ 239 */
188 static unsigned int __blkdev_sectors_to_bio_pa !! 240 static int __blkdev_issue_write_zeroes(struct block_device *bdev,
189 { <<
190 sector_t pages = DIV_ROUND_UP_SECTOR_T <<
191 <<
192 return min(pages, (sector_t)BIO_MAX_VE <<
193 } <<
194 <<
195 static void __blkdev_issue_zero_pages(struct b <<
196 sector_t sector, sector_t nr_s 241 sector_t sector, sector_t nr_sects, gfp_t gfp_mask,
197 struct bio **biop, unsigned in !! 242 struct bio **biop)
198 { 243 {
199 while (nr_sects) { !! 244 struct bio *bio = *biop;
200 unsigned int nr_vecs = __blkde !! 245 unsigned int max_write_zeroes_sectors;
201 struct bio *bio; !! 246 struct request_queue *q = bdev_get_queue(bdev);
202 247
203 bio = bio_alloc(bdev, nr_vecs, !! 248 if (!q)
204 bio->bi_iter.bi_sector = secto !! 249 return -ENXIO;
205 <<
206 if ((flags & BLKDEV_ZERO_KILLA <<
207 fatal_signal_pending(curre <<
208 break; <<
209 <<
210 do { <<
211 unsigned int len, adde <<
212 <<
213 len = min_t(sector_t, <<
214 PAGE_SIZE, nr_ <<
215 added = bio_add_page(b <<
216 if (added < len) <<
217 break; <<
218 nr_sects -= added >> S <<
219 sector += added >> SEC <<
220 } while (nr_sects); <<
221 250
222 *biop = bio_chain_and_submit(* !! 251 /* Ensure that max_write_zeroes_sectors doesn't overflow bi_size */
223 cond_resched(); !! 252 max_write_zeroes_sectors = bdev_write_zeroes_sectors(bdev);
224 } <<
225 } <<
226 253
227 static int blkdev_issue_zero_pages(struct bloc !! 254 if (max_write_zeroes_sectors == 0)
228 sector_t nr_sects, gfp_t gfp, <<
229 { <<
230 struct bio *bio = NULL; <<
231 struct blk_plug plug; <<
232 int ret = 0; <<
233 <<
234 if (flags & BLKDEV_ZERO_NOFALLBACK) <<
235 return -EOPNOTSUPP; 255 return -EOPNOTSUPP;
236 256
237 blk_start_plug(&plug); !! 257 while (nr_sects) {
238 __blkdev_issue_zero_pages(bdev, sector !! 258 bio = next_bio(bio, 0, gfp_mask);
239 if (bio) { !! 259 bio->bi_iter.bi_sector = sector;
240 if ((flags & BLKDEV_ZERO_KILLA !! 260 bio->bi_bdev = bdev;
241 fatal_signal_pending(curre !! 261 bio_set_op_attrs(bio, REQ_OP_WRITE_ZEROES, 0);
242 bio_await_chain(bio); !! 262
243 blk_finish_plug(&plug) !! 263 if (nr_sects > max_write_zeroes_sectors) {
244 return -EINTR; !! 264 bio->bi_iter.bi_size = max_write_zeroes_sectors << 9;
>> 265 nr_sects -= max_write_zeroes_sectors;
>> 266 sector += max_write_zeroes_sectors;
>> 267 } else {
>> 268 bio->bi_iter.bi_size = nr_sects << 9;
>> 269 nr_sects = 0;
245 } 270 }
246 ret = submit_bio_wait(bio); !! 271 cond_resched();
247 bio_put(bio); <<
248 } 272 }
249 blk_finish_plug(&plug); <<
250 273
251 return ret; !! 274 *biop = bio;
>> 275 return 0;
252 } 276 }
253 277
254 /** 278 /**
255 * __blkdev_issue_zeroout - generate number of 279 * __blkdev_issue_zeroout - generate number of zero filed write bios
256 * @bdev: blockdev to issue 280 * @bdev: blockdev to issue
257 * @sector: start sector 281 * @sector: start sector
258 * @nr_sects: number of sectors to write 282 * @nr_sects: number of sectors to write
259 * @gfp_mask: memory allocation flags (for b 283 * @gfp_mask: memory allocation flags (for bio_alloc)
260 * @biop: pointer to anchor bio 284 * @biop: pointer to anchor bio
261 * @flags: controls detailed behavior !! 285 * @discard: discard flag
262 * 286 *
263 * Description: 287 * Description:
264 * Zero-fill a block range, either using hard !! 288 * Generate and issue number of bios with zerofiled pages.
265 * writing zeroes to the device. <<
266 * <<
267 * If a device is using logical block provisi <<
268 * not be released if %flags contains BLKDEV_ <<
269 * <<
270 * If %flags contains BLKDEV_ZERO_NOFALLBACK, <<
271 * -EOPNOTSUPP if no explicit hardware offloa <<
272 */ 289 */
273 int __blkdev_issue_zeroout(struct block_device 290 int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
274 sector_t nr_sects, gfp_t gfp_m 291 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
275 unsigned flags) !! 292 bool discard)
276 { 293 {
277 sector_t limit = bio_write_zeroes_limi !! 294 int ret;
>> 295 int bi_size = 0;
>> 296 struct bio *bio = *biop;
>> 297 unsigned int sz;
>> 298 sector_t bs_mask;
278 299
279 if (bdev_read_only(bdev)) !! 300 bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
280 return -EPERM; !! 301 if ((sector | nr_sects) & bs_mask)
>> 302 return -EINVAL;
281 303
282 if (limit) { !! 304 ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, gfp_mask,
283 __blkdev_issue_write_zeroes(bd !! 305 biop);
284 gfp_mask, biop !! 306 if (ret == 0 || (ret && ret != -EOPNOTSUPP))
285 } else { !! 307 goto out;
286 if (flags & BLKDEV_ZERO_NOFALL !! 308
287 return -EOPNOTSUPP; !! 309 ret = 0;
288 __blkdev_issue_zero_pages(bdev !! 310 while (nr_sects != 0) {
289 biop, flags); !! 311 bio = next_bio(bio, min(nr_sects, (sector_t)BIO_MAX_PAGES),
>> 312 gfp_mask);
>> 313 bio->bi_iter.bi_sector = sector;
>> 314 bio->bi_bdev = bdev;
>> 315 bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
>> 316
>> 317 while (nr_sects != 0) {
>> 318 sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects);
>> 319 bi_size = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0);
>> 320 nr_sects -= bi_size >> 9;
>> 321 sector += bi_size >> 9;
>> 322 if (bi_size < (sz << 9))
>> 323 break;
>> 324 }
>> 325 cond_resched();
290 } 326 }
291 return 0; !! 327
>> 328 *biop = bio;
>> 329 out:
>> 330 return ret;
292 } 331 }
293 EXPORT_SYMBOL(__blkdev_issue_zeroout); 332 EXPORT_SYMBOL(__blkdev_issue_zeroout);
294 333
295 /** 334 /**
296 * blkdev_issue_zeroout - zero-fill a block ra 335 * blkdev_issue_zeroout - zero-fill a block range
297 * @bdev: blockdev to write 336 * @bdev: blockdev to write
298 * @sector: start sector 337 * @sector: start sector
299 * @nr_sects: number of sectors to write 338 * @nr_sects: number of sectors to write
300 * @gfp_mask: memory allocation flags (for b 339 * @gfp_mask: memory allocation flags (for bio_alloc)
301 * @flags: controls detailed behavior !! 340 * @discard: whether to discard the block range
302 * 341 *
303 * Description: 342 * Description:
304 * Zero-fill a block range, either using hard !! 343 * Zero-fill a block range. If the discard flag is set and the block
305 * writing zeroes to the device. See __blkde !! 344 * device guarantees that subsequent READ operations to the block range
306 * valid values for %flags. !! 345 * in question will return zeroes, the blocks will be discarded. Should
>> 346 * the discard request fail, if the discard flag is not set, or if
>> 347 * discard_zeroes_data is not supported, this function will resort to
>> 348 * zeroing the blocks manually, thus provisioning (allocating,
>> 349 * anchoring) them. If the block device supports WRITE ZEROES or WRITE SAME
>> 350 * command(s), blkdev_issue_zeroout() will use it to optimize the process of
>> 351 * clearing the block range. Otherwise the zeroing will be performed
>> 352 * using regular WRITE calls.
307 */ 353 */
308 int blkdev_issue_zeroout(struct block_device * 354 int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
309 sector_t nr_sects, gfp_t gfp_m !! 355 sector_t nr_sects, gfp_t gfp_mask, bool discard)
310 { 356 {
311 int ret; 357 int ret;
312 <<
313 if ((sector | nr_sects) & ((bdev_logic <<
314 return -EINVAL; <<
315 if (bdev_read_only(bdev)) <<
316 return -EPERM; <<
317 <<
318 if (bdev_write_zeroes_sectors(bdev)) { <<
319 ret = blkdev_issue_write_zeroe <<
320 gfp_mask, flag <<
321 if (ret != -EOPNOTSUPP) <<
322 return ret; <<
323 } <<
324 <<
325 return blkdev_issue_zero_pages(bdev, s <<
326 } <<
327 EXPORT_SYMBOL(blkdev_issue_zeroout); <<
328 <<
329 int blkdev_issue_secure_erase(struct block_dev <<
330 sector_t nr_sects, gfp_t gfp) <<
331 { <<
332 sector_t bs_mask = (bdev_logical_block <<
333 unsigned int max_sectors = bdev_max_se <<
334 struct bio *bio = NULL; 358 struct bio *bio = NULL;
335 struct blk_plug plug; 359 struct blk_plug plug;
336 int ret = 0; <<
337 360
338 /* make sure that "len << SECTOR_SHIFT !! 361 if (discard) {
339 if (max_sectors > UINT_MAX >> SECTOR_S !! 362 if (!blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask,
340 max_sectors = UINT_MAX >> SECT !! 363 BLKDEV_DISCARD_ZERO))
341 max_sectors &= ~bs_mask; !! 364 return 0;
>> 365 }
342 366
343 if (max_sectors == 0) !! 367 if (!blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask,
344 return -EOPNOTSUPP; !! 368 ZERO_PAGE(0)))
345 if ((sector | nr_sects) & bs_mask) !! 369 return 0;
346 return -EINVAL; <<
347 if (bdev_read_only(bdev)) <<
348 return -EPERM; <<
349 370
350 blk_start_plug(&plug); 371 blk_start_plug(&plug);
351 while (nr_sects) { !! 372 ret = __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask,
352 unsigned int len = min_t(secto !! 373 &bio, discard);
353 !! 374 if (ret == 0 && bio) {
354 bio = blk_next_bio(bio, bdev, <<
355 bio->bi_iter.bi_sector = secto <<
356 bio->bi_iter.bi_size = len << <<
357 <<
358 sector += len; <<
359 nr_sects -= len; <<
360 cond_resched(); <<
361 } <<
362 if (bio) { <<
363 ret = submit_bio_wait(bio); 375 ret = submit_bio_wait(bio);
364 bio_put(bio); 376 bio_put(bio);
365 } 377 }
366 blk_finish_plug(&plug); 378 blk_finish_plug(&plug);
367 379
368 return ret; 380 return ret;
369 } 381 }
370 EXPORT_SYMBOL(blkdev_issue_secure_erase); !! 382 EXPORT_SYMBOL(blkdev_issue_zeroout);
371 383
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